When a pirate named Captain Jack Silver steals the Elements of Harmony, it's up to Twilight and the rest of the Mane Six to get them back. Soon enough they all find themselves on a swashbuckling adventure to find the SEVENTH Element of Harmony.

A slightly different start to Discord's reformation with a more cautious Celestia, a reluctant yet curious mane six, and a willing-and-wanting-to-try Discord that has promised to leave Equestria if he cannot get along with ponykind to a degree.

While the Princesses and their staff are away until the Castle's recent parasprite problem can be dealt with, a group of confused Viking warriors suddenly appear in the royal kitchen. Massive property damage soon follows.

The Mane Six have just defeated Discord...or so they think. He disappeared and has since now returned with a new force of five villains from other worlds calling themselves the Elements of Chaos. Their intent: challenge the Elements of Harmony and harness Equestria's magic for their own ends. Can they be stopped? And is everything as it seems?

... and just how did the Precursors channel(and steal) said magic? Last I checked, they had none of their own. I may not be an expert on Fable, but I'm pretty sure you need a will user to use it, and in Harry Potter, the only known way to take away a wizard's magic is dementors.